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Doepfer A-101-6 Opto VCF Opto FET Filter / Phaser

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Doepfer A-101-6 Opto VCF Opto FET Filter / Phaser

$96.00 to $127.00 Price Tier: Budget

All time low price

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Page last updated Jul 04, 2026

Pricing and availability

We compare 600+ stores and found this item at 2 stores. Prices updated July 4, 2026.

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Price

4.0 (1)

$127.00 3 available New

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5.0 (2)

$96.00

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Average Price: $112

Budget/Beginner

$149

$350+

Price Tier

In the Modular Synthesizers category, Doepfer A-101-6 Opto VCF Opto FET Filter / Phaser is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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Price History

Based on price data from 1 merchant for "Doepfer A-101-6 Opto VCF Opto FET Filter / Phaser". Prices shown reflect NEW condition. Tracking began Apr 7, 2026.

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Description

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Unlock a new dimension of sound with the Doepfer A-101-6 Opto VCF Opto FET Filter / Phaser, a versatile module designed for the discerning modular synthesizer enthusiast. This six-stage opto FET filter is not your average VCF; it uses innovative opto FET technology to control the filter frequency, offering a unique sonic palette that adds both depth and character to your music.

Whether you're aiming for lush, sweeping phaser effects or intricate filter sweeps, this module delivers with precision. Its design ensures smooth transitions and a warm, organic sound that will captivate both live audiences and studio listeners. Perfect for those who crave both classic and contemporary tones, the A-101-6 is as adaptable as it is intuitive.

Engineers and musicians alike will appreciate the module's efficient power consumption and compact dimensions, making it a seamless addition to any existing setup.

Key Features:

Six-stage opto FET VCF/Phaser for versatile sound shaping
Innovative opto FET technology for filter frequency control
Ideal for creating phaser effects and intricate filter sweeps
Compact dimensions for easy integration into modular setups
Efficient power requirement at just 40 mA

Product specs

Available since	August 2015
Width	8 TE / HP

FAQs

What type of filter does the Doepfer A-101-6 Opto VCF use?: The Doepfer A-101-6 Opto VCF utilizes an optical FET filter design, which is known for providing smooth, organic filtering effects suitable for phaser and filter applications.
How many HP does the Doepfer A-101-6 module take up in a modular synth setup?: The Doepfer A-101-6 occupies 8 HP in a Eurorack modular synthesizer system, allowing for compact integration into your setup.
Can the Doepfer A-101-6 Opto VCF be used as a phaser?: Yes, the Doepfer A-101-6 can function as both a filter and a phaser, providing versatile sound-shaping capabilities for modular synthesizer enthusiasts.
What makes the Doepfer A-101-6 Opto VCF distinct from other filters?: The Doepfer A-101-6 stands out due to its optical FET design, which offers a unique sound character and smooth modulation capabilities, differing from traditional VCFs.
Is the Doepfer A-101-6 suitable for live performance setups?: With its compact size and versatile sound-shaping abilities, the Doepfer A-101-6 is well-suited for live performance setups, offering both filter and phaser effects in a single module.

Videos

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TheBenny333

Doepfer A-101-6 Demo Part 1

TheBenny333

Doepfer A-101-6 Demo Part 2

TheBenny333

Doepfer A-101-6 Demo Part 4

TheBenny333

Doepfer a-101-6 Opto FET Filter Eurorack Module in Lowpass Mode Sequence

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Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Doepfer A-101-6 Opto VCF Opto FET Filter / Phaser.

Features and functionality

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The Doepfer A-101-6 Opto VCF offers unique access to the feedback path, allowing for creative sound design possibilities, though settings changes are limited to jumpers on the back.
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The Doepfer Opto FET can achieve highly unconventional sounds, especially in specific modes, which are favored for their experimental characteristics.
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The Blue Lantern Asteroid VCF features 8 outputs, providing a versatile "filter playground" for dynamic sound shaping.
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Use cases and applications

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It's particularly noted for producing crazy sounds in all-pass modes, making it a favored tool for experimental sound design.
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The ADDAC 702 Dual VC Filter includes distortion toggles and extensive CV control, making it ideal for creating wild, cabinet-like sounds in modular setups.
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The Winterbloom Neptune filter operates as a spectral crossfader between LP and HP inputs, delivering a wide range of tones from dirt to classic filter sounds.
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Comparisons

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While not as extreme as its name suggests, the Doepfer A106-1 Xtreme filter is still capable of producing good sounds, especially when paired with distortion sources like the Noise Engineering Terci Ruina.
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The XAOC Belgrad is more akin to an advanced phaser, doubling as a filter, offering unique sound design capabilities distinct from traditional filters.
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User experience

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Owners have expressed that the resonance control on some Doepfer filters is on a smaller pot, making fine adjustments more challenging compared to modules with full-sized controls.
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